农化制品板块12月16日跌1.22%，美邦股份领跌，主力资金净流出5.49亿元

Group 1 - The agricultural chemical sector experienced a decline of 1.22% on December 16, with Meibang Co., Ltd. leading the losses [1] - The Shanghai Composite Index closed at 3824.81, down 1.11%, while the Shenzhen Component Index closed at 12914.67, down 1.51% [1] - A detailed table of individual stock performance within the agricultural chemical sector is provided [1] Group 2 - The agricultural chemical sector saw a net outflow of 549 million yuan from main funds, while retail investors contributed a net inflow of 354 million yuan [2] - Speculative funds recorded a net inflow of 195 million yuan into the agricultural chemical sector [2] - A detailed table of fund flows for individual stocks in the agricultural chemical sector is included [2]